Modeling Longitudinal Dynamics in the Fermilab Booster Synchrotron

Conference · Wed Jun 01 04:00:00 EDT 2016

DOI:https://doi.org/10.18429/JACoW-IPAC2016-MOPOY013· OSTI ID:1271291

Ostiguy, Jean-Francois ^[1]; Bhat, Chandra ^[1]; Lebedev, Valeri ^[1]

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1. Fermilab

The PIP-II project will replace the existing 400 MeV linac with a new, CW-capable, 800 MeV superconducting one. With respect to current operations, a 50% increase in beam intensity in the rapid cycling Booster synchrotron is expected. Booster batches are combined in the Recycler ring; this process limits the allowed longitudinal emittance of the extracted Booster beam. To suppress eddy currents, the Booster has no beam pipe; magnets are evacuated, exposing the beam to core laminations and this has a substantial impact on the longitudinal impedance. Noticeable longitudinal emittance growth is already observed at transition crossing. Operation at higher intensity will likely necessitate mitigation measures. We describe systematic efforts to construct a predictive model for current operating conditions. A longitudinal only code including a laminated wall impedance model, space charge effects, and feedback loops is developed. Parameter validation is performed using detailed measurements of relevant beam, rf and control parameters. An attempt is made to benchmark the code at operationally favorable machine settings.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1271291
• Report Number(s): FERMILAB-CONF-16-162-AD; 1469755
• Country of Publication: United States
• Language: English

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